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Re: [PATCH MULTISERIES] Optimize Xen barriers
- To: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>, "win-pv-devel@xxxxxxxxxxxxxxxxxxxx" <win-pv-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Owen Smith <owen.smith@xxxxxxxxxx>
- Date: Wed, 20 May 2026 14:47:31 +0000
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- Thread-topic: [PATCH MULTISERIES] Optimize Xen barriers
This series (xenbus, xencons, xennet, xenvbd, xenvkbd, xenvif)
Reviewed-by: Owen Smith <owen.smith@xxxxxxxxxx>
________________________________________
From: win-pv-devel <win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx> on behalf of Tu
Dinh <ngoc-tu.dinh@xxxxxxxxxx>
Sent: 18 May 2026 11:24 AM
To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Cc: Tu Dinh
Subject: [PATCH MULTISERIES] Optimize Xen barriers
This series aims to optimize the use of memory barriers in all Windows
PV drivers.
Particularly, the following have been changed:
* x86 is TSO and only needs a compiler barrier as read/write barriers.
So the xen_* barriers in xen-types.h don't always need to be
KeMemoryBarrier (which is a full barrier using a locked instruction).
* Barriers right next to Interlocked* operations were deleted, as these
operations serve as implicit full barriers.
* Ring operations were converted acquire-release semantics instead of
full barriers.
* As a related change, LockThread tracking was conditioned to debug
builds.
--
Ngoc Tu Dinh | Vates XCP-ng Developer
XCP-ng & Xen Orchestra - Vates solutions
web: https://vates.tech
|
